Thermo-shrinkable polyester type film and tube and processing method for preparing the tube
First Claim
Patent Images
1. A thermo-shrinkable polyester type film which is obtained from a material selected from the group consisting of a polyester having a glass transition temperature of no less than 35°
- C., a polyester copolymer having a glass transition temperature of no less than 35°
C., and a mixture of both of said polyester and polyester copolymer with at least one other polymer, wherein said film has the following shrinking properties;
a shrinking ratio in the one axis is not less than 30% of 80°
C. and not less than 50% at 100°
C., anda shrinking ratio in perpendicular axis to the former axis is not more than 15% in the range of 55°
-105°
C., and the minimum value of the shrinking ratio occurs at a temperature in the range of 55°
-105°
C.; and
having an orientation factor of not more than 100×
10-3.
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Abstract
A thermo-shrinkable polyester type film having the following shrinking properties:
a shrinking ratio in one axis is not less than 30% at 80° C. and not less than 50% at 100° C., and
a shrinking ratio in a perpendicular axis to the former axis shows the minimum value at a temperature range of 80°±25° C., and the process therefor.
This film shows an excellent shrinking properties for packaging.
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Citations
14 Claims
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1. A thermo-shrinkable polyester type film which is obtained from a material selected from the group consisting of a polyester having a glass transition temperature of no less than 35°
- C., a polyester copolymer having a glass transition temperature of no less than 35°
C., and a mixture of both of said polyester and polyester copolymer with at least one other polymer, wherein said film has the following shrinking properties;a shrinking ratio in the one axis is not less than 30% of 80°
C. and not less than 50% at 100°
C., anda shrinking ratio in perpendicular axis to the former axis is not more than 15% in the range of 55°
-105°
C., and the minimum value of the shrinking ratio occurs at a temperature in the range of 55°
-105°
C.; andhaving an orientation factor of not more than 100×
10-3. - View Dependent Claims (2, 3)
- C., a polyester copolymer having a glass transition temperature of no less than 35°
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4. A tube of a thermo-shrinkable polyester type film which has a jointed surface being jointed by at least one solvent or swelling agent having a solubility or swelling ability to a polyester and a solubility index of 8.0-13.8, and the following shrinking properties:
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a peripheral shrinking ratio is not less than 30% at 80°
C. and not less than 50% at 100°
C., anda longitudinal shrinking ratio is not more than 15% in the range of 55°
-105°
C., and the minimum value of the shrinking ratio occurs at a temperature in the range of 55°
to 105°
C. - View Dependent Claims (5, 6, 7, 8)
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9. A process for production of a tube from polyester type film which comprises:
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disposing a polyester type film having shrinking properties wherein a shrinking ratio in one axis is not less than 30% at 80°
C. and not less than 50% at 100°
C., and a shrinking ratio in a perpendicular axis to the former axis is not more than 15% in the range of 55°
-105°
C., and the minimum value of the shrinking ratio in the perpendicular axis occurs at a temperature in the range of 55°
-105°
C.,spreading at least one jointed surface of the film with a solvent or a swelling agent having a solubility or swelling ability to a polyester and a solubility parameter or 8.0-13.8, and jointing the surfaces to be jointed to give a tubular film before the solvent or swelling agent is dried. - View Dependent Claims (10, 11, 12)
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13. A process for production of a tube from polyester type film which comprises:
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disposing a polyester type film having shrinking properties wherein a shrinking ratio in one axis is not less than 30% at 80°
C. and not less than 50% at 100°
C., and a shrinking ratio in a perpendicular axis to the former axis is not more than 15% in the range of 55°
-105°
C., and the minimum value of the shrinking ratio in the perpendicular axis occurs at a temperature in the range of 55°
-105°
C.,disposing an adhesive layer on entire or part of at least one surface to be jointed, spreading at least one surface with a solvent or a swelling agent having a solubility or swelling ability to a polyester and a solubility parameter of 8.0-13.8, and jointing the surfaces to be jointed to give a tubular film before the solvent or swelling agent is dried. - View Dependent Claims (14)
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Specification